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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55865e35de9a680795c873cae3df822f63ad47c2e8c8d12faa31adba6f22e24e' 
  AND token = 'w2rjQkF3pQ42EgAcJYMGr16ZeNu8xDt0Eh199adLB30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}